QxOrm  1.2.7
C++ Object Relational Mapping library
get_base_class.h
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00001 /****************************************************************************
00002 **
00003 ** http://www.qxorm.com/
00004 ** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
00005 **
00006 ** This file is part of the QxOrm library
00007 **
00008 ** This software is provided 'as-is', without any express or implied
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00012 ** Commercial Usage
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00015 ** Software or, alternatively, in accordance with the terms contained in
00016 ** a written agreement between you and Lionel Marty
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00018 ** GNU General Public License Usage
00019 ** Alternatively, this file may be used under the terms of the GNU
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00031 
00032 #ifndef _QX_GET_BASE_CLASS_H_
00033 #define _QX_GET_BASE_CLASS_H_
00034 
00035 #ifdef _MSC_VER
00036 #pragma once
00037 #endif
00038 
00046 #include <boost/mpl/if.hpp>
00047 #include <boost/mpl/logical.hpp>
00048 #include <boost/type_traits/is_same.hpp>
00049 
00050 #include <QxTraits/get_class_name.h>
00051 
00052 namespace qx {
00053 namespace trait {
00054 
00055 class no_base_class_defined
00056 { public: no_base_class_defined() { ; }; virtual ~no_base_class_defined() { ; }; virtual void dummy() = 0; };
00057 
00062 template <class T>
00063 class get_base_class
00064 { public: typedef qx::trait::no_base_class_defined type; };
00065 
00066 template <class T>
00067 class is_base_class_defined
00068 { public: enum { value = (boost::is_same<typename qx::trait::get_base_class<T>::type, qx::trait::no_base_class_defined>::value ? 0 : 1) }; };
00069 
00070 template <class T>
00071 class get_base_class_2
00072 {
00073 private: typedef typename qx::trait::get_base_class<T>::type type_base;
00074 private: enum { is_base_ok = (boost::is_same<type_base, qx::trait::no_base_class_defined>::value ? 0 : 1) };
00075 public: typedef typename boost::mpl::if_c<is_base_ok, type_base, T>::type type;
00076 };
00077 
00078 } // namespace trait
00079 } // namespace qx
00080 
00081 QX_REGISTER_CLASS_NAME(qx::trait::no_base_class_defined)
00082 
00083 #define QX_REGISTER_BASE_CLASS(derivedClass, baseClass) \
00084 namespace qx { namespace trait { \
00085 template <> \
00086 class get_base_class< derivedClass > \
00087 { public: typedef baseClass type; }; \
00088 } } // namespace qx::trait
00089 
00090 #define QX_GET_BASE_CLASS(T)                       qx::trait::get_base_class< T >::type
00091 #define QX_GET_BASE_CLASS_WITH_TYPENAME(T)         qx::trait::get_base_class< typename T >::type
00092 #define QX_IS_BASE_CLASS_DEFINED(T)                qx::trait::is_base_class_defined< T >::value
00093 #define QX_IS_BASE_CLASS_DEFINED_WITH_TYPENAME(T)  qx::trait::is_base_class_defined< typename T >::value
00094 #define QX_GET_BASE_CLASS_2(T)                     qx::trait::get_base_class_2< T >::type
00095 #define QX_GET_BASE_CLASS_2_WITH_TYPENAME(T)       qx::trait::get_base_class_2< typename T >::type
00096 
00097 #endif // _QX_GET_BASE_CLASS_H_